METOLOSE: CONTENTS PAGE

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2 METOLOSE: CONTENTS PAGE 2 Preface What is Metolose Substitution types Specifications 1) Available grades & viscosity 2) Nomenclature 3) Packaging Characteristics of Metolose Properties of Metolose 1) Powder properties 2) Solution properties a) Thermal gelation b) viscosity c) Rheology d) Compatibility with electrolytes e) Solubility at various ph values f) Surface activity g) Solubility in solvents 3) Film properties Applications of Metolose Please note: The information and data contained herein are believed to be correct and are given in good faith. However, no liability is accepted therefore, and no warranty or freedom from any patent is to be inferred. The general specifications for the products are those in use at the time of printing of this brochure and are subject to change in the future. Please contact us if you have any questions or require more information.

3 METOLOSE: PREFACE 3 Shin-Etsu Chemical Co., Ltd. began to produce water-soluble cellulose ethers in 1962, with the trade name METOLOSE. METOLOSE can be used as a binder for solid dosage forms such as tablets and granules. It also provides a variety of functions such as water retention, thickening, protective colloid, surface activity, sustained release, etc. It is also regarded as a non-digestive fiber. METOLOSE consists of Methylcellulose (Methylcellulose USP) and three substitution types of Hydroxypropyl Methylcellulose (Hypromellose USP) each available in several grades differing in viscosity. Highly purified pulp is etherified with methyl or with the combination of methyl chloride and propylene oxide to form a water soluble, non ionic cellulose ether. We trust that the information presented in his brochure will be of interest to you. If you have any questions on this information, would like information on our other specially developed pharmaceutical excipients, or if we can be of any further assistance, please do not hesitate to contact us.

4 METOLOSE: WHAT IS METOLOSE? 4 METOLOSE is a nonionic water-soluble cellulose ether which is derived from pulp. To produce METOLOSE, the pulp is first treated with caustic soda to obtain alkali-cellulose, and this is etherified with chloromethane or with the combination of chloromethane and propylene oxide at high temperature. Cellulose is not soluble in water due to its crystalline structure with strong intermolecular hydrogen bonding between OH groups. When the hydrogen atoms of some of the OH groups are substituted with methyl or hydroxypropyl groups, the resulting methoxy and hydroxypropoxy groups interfere with the intermolecular hydrogen bonding, so that the polymer chains are less strongly bound to each other. This allows water to penetrate into the intermolecular spaces of cellulose, and the polymer becomes water-soluble. This is the reason why METOLOSE is soluble in water while pulp, the source of METOLOSE, is not. Pulp Caustic soda Etherification agents Production flow diagram Alkali-cellulose Reaction Washing Drying Pulverization Screening & Mixing Packaging

5 METOLOSE: SUBSTITUTION TYPES 5 METOLOSE includes several types with different levels and kinds of substitution. The available types are SM, 60SH, 65SH, and 90SH. Their substitution levels are shown below. Typical substitution level of METOLOSE Type Methoxy, D.S. Hydroxypropoxy, M.S. Name in the USP CAS registry number SM 1.8 Methylcellulose SH Hypromellose, Substitution type SH Hypromellose, Substitution type SH Hypromellose, Substitution type D.S.= Degree of substitution, i.e. the average number of substituted hydroxyl groups in the anhydrous glucose unit. M.S.= Molar substitution, i.e. the average number of substituents in the anhydrous glucose unit.

6 METOLOSE: SPECIFICATIONS 6 General name Methylcellulose Hypromellose Type SM 6OSH 65SH 9OSH USP Description and solubility Conforms USP Characters Conforms EP Identification (A-C) Conforms USP Identification (A-F) Conforms EP ph EP Viscosity See table below USP & EP Loss on drying Not more than 5.0% USP Residue on ignition Not more than 1.5% USP Residue on ignition Not more than 1.0% EP Heavy metals Within the limit (Not more than 0.001%) USP Appearance of solution Conforms EP Chlorides Within the limit (Not more than 0.5%) EP OVI Conforms USP Methoxy content % % % % USP Hydroxypropoxy content % % % USP This material does not require CVI testing, under the USP-NF (467) stipulation that... based on knowledge of the manufacturing process and controlled handling and storage... there is no potential for the specific toxic solvents to be present... if tested, will comply established standards. Each type of METOLOSE includes several viscosity grades as shown below. METOLOSE SR is designed for hydrophilic matrix tablets. (See separate brochure for information on METOLOSE SR) Available grades and viscosity specifications : METOLOSE, SR: METOLOSE SR SM 60SH 65SH 90SH Labeled USP Specification EP Specification Viscosity (cp)*1 (mpa s)* , SR , SR *3, SR *3, SR *3 *1 USP viscosity is 80%-120% for labelled viscosity 100 cp and lower. USP viscosity is 75%-140% for labelled viscosity over 100 cp. *2 EP viscosity is 75%-140% for all labelled viscosities. *3 Due to the difference in viscosity measurement method, it is not possible to prepare products meeting both viscosity specifications for labelled viscosities higher than Please refer to Fig. 1 for the relationship between USP viscosity and EP viscosity.

7 METOLOSE: SPECIFICATIONS 7 Viscosity The relationship between the USP viscosity and the EP viscosity is shown in Fig. I.. At a higher viscosity of HPMC there is a larger difference between the USP and the OP viscosities. Nomenclature Substitution type Labeled viscosity Other Special powder Property, etc. SM- 60SH- 90SH SR Packaging Package: Double-layered polyethylene bag in fibre drum Net weight: 40kg or 50kg depending on grade

8 METOLOSE: CHARACTERISTICS OF METOLOSE 8 1 Odourless and tasteless METOLOSE is a fibrous or granular powder, white to slightly off-white in color, and practically odourless and tasteless. 2 Low ash content As METOLOSE is a non-ionic organic compound, it can be completely combusted under appropriate burning conditions. It also can be effectively purified by washing, so its ash content is very low. 3 Water soluble thickener Although METOLOSE is insoluble in hot water, it is soluble in cold water, giving a transparent viscous solution. 5 4 Thermal gelation An aqueous solution of METOLOSE gels or forms a precipitate when heated to a certain temperature, but it reverts to the clear solution state on subsequent cooling. The thermal gelation/precipitation temperature depends on the substitution type, concentration, and heating rate. Resistant to salting out METOLOSE is non-ionic and it is not a polyelectrolyte. An aqueous solution of METOLOSE is relatively stable in the presence of inorganic salts or organic electrolytes. However, when the concentration of electrolytes exceeds a certain limit, gelation or precipitation may occur. 7 6 Stable over a wide ph range The viscosity of METOLOSE solution is hardly affected by acid or alkali, and is stable at ph However, the viscosity tends to decrease during prolonged storage of a solution under acidic or alkaline conditions. Soluble in some organic solvents Owing to the prescence of relatively hydrophobic methoxyl and hydroxypropoxyl groups, METOLOSE is soluble in some organic solvents and also in water-organic solvent mixtures. 8 Surface active An aqueous solution of METOLOSE has a high surface activity and functions as a protective colloid agent, and a stabiliser for emulsions, suspensions, or foam. 9 Film forming METOLOSE provides strong, flexible and transparent films with a good barrier property against oils.

9 METOLOSE: PROPERTIES OF METOLOSE 9 METOLOSE is a fibrous or granular powder, white to slightly off-white in colour, and practically odourless and tasteless. 1) Powder properties Appearance True density Bulk density Tapped density Angle of repose Degradation temperature Self ignition temperature Hygroscopicity Dust explosion White or slightly off-white powder, fibrous powder or granules g/ml g/ml g/ml C approx. 360 C Depends on substitution type. Kst=approx.100 bar m/s* 2) Solution Properties 1.) Thermal gelation An aqueous solution of METOLOSE changes to a gel when heated to a certain temperature. This thermal gelation is thought to be due to the formation of a network of polymeric chains via hydrophobic interactions between highly substituted portions. i. e. anhydroglucose units having a degree of substitution of 3. Different substitution types have different gelation behaviours. The gel reverts to its original solution form when it is cooled down. The thermal gelation of METOLOSE has various applications. For more information on the thermal gelation, refer to the article by Takahashi et al., Japanese Journal of Polymer Science and Technology, Vol. 38, No. 3, p ) Viscosity The viscosity of solutions of METOLOSE. as well as other water-soluble polymers, is considered to reflect tangling of long polymeric chains in the solution. Therefore, the viscosity of METOLOSE solution is related to molecular weight. The molecular weight of METOLOSE is controlled in the manufacturing process. 3.) Rheology METOLOSE solutions exhibit a non-newtonian flow, such that the apparent viscosity decreases with increasing shear rate. The non-newtonian flow is more marked in higher viscosity grades, and at higher concentrations.

10 METOLOSE: PROPERTIES OF METOLOSE 10 4.) Compatibility with electrolytes METOLOSE has a superior compatibility with electrolytes compared with other ionic polymers. However, if the concentration of electrolyte exceeds a certain limit, METOLOSE will be salted out. The tolerance to electrolytes depends on the substitution type. Generally, METOLOSE with lower substitution levels tends to exhibit a higher tolerance for salting out. 5.) Solubility at various ph values A METOLOSE solution maintains a constant viscosity over the ph range of At ph outside of this range, the viscosity will he lower. If a METOLOSE solution is stored at low ph (acidic), its viscosity will be gradually decreased due to depolymerization. 6.) Surface activity METOLOSE can be considered as a non-ionic surfactant, as it has both hydrophilic and hydrophobic groups in the molecule. Due to such characteristics, it functions as a superior protective colloid, being effective for stabilization of emulsions, suspensions, and foams. 7.) Solubility in organic solvents METOLOSE is a water-soluble polymer and it also dissolves in some organic solvents. Among the substitution types, 6OSH has the best solubility in organic solvents. 3) Film Properties Transparent films are obtained by casting METOLOSE solutions. Although METOLOSE films are relatively rigid, they can be made flexible by adding plasticizers such as glycerin, propylene glycol. sorbitol, and triethyl citrate. The film properties markedly depend on the moisture content.

11 METOLOSE: APPLICATIONS OF METOLOSE 11 WATER RETENTION METOLOSE has a water retention property. This characteristic leads to the following functions: Preventing water loss from, or entry into a base material. Preventing evaporation of water. Gel drugs METOLOSE can be combined with other synthetic polymers or gelatinizing agents to prevent the separation of water or alcohol from a gel drug formulation. THICKENING Cataplasms METOLOSE thickens the base ot cataplasms, improving workability. Suspension drugs METOLOSE is used as a stabilizer for suspensions of antacid drugs. OTHERS Sustained release tablets Hydrogel-forming property of METOLOSE can be used to delay the release of an active ingredient from tablets. For such hydrophilic matrix sustained-release tablets, METOLOSE SH types are typically used. Dietary supplements METOLOSE is recognized as a non-digested polymer Capsules METOLOSE is used as a basic component for CELLULOSE capsules Application Binder for tablets and granules Sustained release matrix tablets Gel drugs Suitable grades SM-15, 60SH-50 60SH-50, -4000, 90SH-4000, -4000SR, SR 60SH-4000, 90SH-4000

12 Shin-Etsu Chemical Co.,Ltd Cellulose & Pharmaceutical Excipients Department 6-1, Ohtemachi 2-chome, Chiyoda-ku, Tokyo, Japan TEL: FAX: Printed /500

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